Bronze
Crossbow style Fibula/pin used to hold together the Toga/clothing of the Roman Soldier
and Citizen.
Called Crossbow due to its unique shape similar to a crossbow. This
example however is somewhat unique. It has an iron segment that
constitutes the cross piece, ending in two bronze spheres. The point
of the fibula where the remnants of the iron spring and pin are has a
curled bronze piece. The arch has small dots engraved on it while a
bronze segment is wrapped around at the end of the arch. The arch would have been where
the fabric bunched while the pin secured it. In the flat section
there is a dot pattern border that surrounds it. Within this border
is a Greek inscription

M
I X A I A

This simply states "Mikail" of Michael as the name is known today.

That fact that it is inscribed in Greek indicates that it perhaps was part
of the East Roman empire which largely spoke Greek, and fully Greek by the
time it became the Byzantine Empire.
(1)